Emery wheel dresser



1765- 1947- s. B. FINNERTY EMERY WHEEL DRESSER Filed Jan. 19, 1944 INVENTOR Samuel 5. Fl nerfy BY 65w W HIS ATTORNEY ?atented Feb. 11, 1947 EMERY WHEEL DRE SSER Samuel B. Finnerty, San Francisco, Calif., as-

signor of one-half to Harry King, Berkeley,

Calif.

Application January 19, 1944, Serial No. 518,852

My invention relates to tools for dressing emery wheels, and particularly to a device for lubricating the bearings for the dressing discs thereof.

It is among the objects of my invention to provide a tool for dressing emery wheels having means for maintaining effective lubrication of the dressing discs while the tool is in use.

Another object is to provide means for pre- Claims. (Cl. 12537) venting undue wear upon the bearing surfaces on 1 0 which the dressing discs are rotated whereby correct alinement may be preserved and the useful life of the discs and bearings prolonged.

A further object is to provide a dressing tool arranged to carry a reserve supply of lubricant for delivery to the bearing areas of the tool substantially continuously under pressure while the tool is in use.

My invention possesses other objects and features of value, some of which with the foregoing will be set forth in the following description of the invention. It is to be understood that I do not limit myself to the showing made by the said description and the drawing as I may adopt variant forms of the invention within the scope 5 of the appended claims.

In the drawing:

Figure 1 is a side elevation of an emery wheel dressing tool embodying my invention, parts being broken away.

Figure 2 is a sectional view of the head of the tool, taken upon the line 2--2 of Figure 1, the figure being drawn upon a larger scale.

Figure 3 is a side elevation of the head as viewed from the back of Figure 1.

Figure 4 is a fragmental sectional view similar to Figure 2, and illustrating a modified construction of the lubricant delivering passage.

Figure 5 is a side elevation of a modified form of holder.

Figure 6 is a plan view of the device shown in Figure 5, parts being shown in section.

In terms of broad inclusion, the emery wheel dressing tool of my invention comprises a holder vention comprises a bifurcated holder l upon which is mounted a set of toothed dressing discs 2 suitably journaled upon a shaft 3. In the preferred arrangement illustrated in Figure 1 of the drawing, the discs are mounted in close contact with each other upon a sleeve l which rotates upon the shaft 3, and upon which the discs are independently rotatable. The faces of the discs are preferably machined to insure uniformly close contact between the discs. Washers or gaskets 6 hold the discs 2 upon the sleeve l, and seal the space between the ends of the sleeve and the inner faces of the holder arms.

The ends of the shaft 3 are received in openings l, positioned in axial alinement with each other, near the ends of the arms of the holder l. The shaft 3 is replaceably held in position upon the holder l by side plates 8 and 9, at least one of which is removably secured to the holder by a machine screw or other suitable securing means H. Preferably one end of the shaft 3 is squared, or cut away to form a tongue, as at l2, to efiect non-rotatable engagement with the plate 9, whereby the shaft is held against rotation while the sleeve 4 and discs 2 rotate relative thereto. A gasket i4 is preferably interposed between the plate 9 and the adjacent face of the holder I.

The shaft 3 is provided with an axial passage It open at one end of the shaft and communifor carrying a plurality of toothed dressing discs journaled for independent rotation upon a common shaft. A chamber, preferably in the handle of the holder, is arranged to contain a supply of lubricant. Suitable passages connect the chamber withthe bearing, areas between the discs and shaft; and means are provided for applying pressure to the lubricant for forcing a substantially continuous supply of lubricant to the bearing areas while the tool is in use.

In terms of greater detail, the tool of my incating with one or more radial passages ll each opening into 'a groove l8 longitudinally disposed upon the outer or bearing surface of the shaft. The passages H are preferably positioned about midway between the ends of the shaft 3; and the grooves l8 preferably taper towards the ends of the shaft to points substantially alined with the outermost discs 2. The sleeve 4 is provided with one or more openings It in the plane of the passage I1, and grooves 2i upon its outer bearing surface.

The holder 1 is provided with a hollow handle portion 2|, providing a chamber 22 arranged to contain a supply of a lubricant, such as a relatively heavy bodied grease. A passage 23 is provided to communicate between the chamber 22 and the passage Iii, for delivering lubricant from the chamber to the shaft 3..

As illustrated in Figures 1 and 2, the passage 23 is formed as a groove in the inner face of the plate 8 secured to the holder i. Qne end of the groove extends over the open end of the shaft passage l6, and theother extends over a holder 1 to prevent leakage of grease therebetween. The plate 8 is preferably removable to facilitate cleaning the passages should they become obstructed.

Figure 4 illustrates a modified construction in which a tube 21 is connected at one end into the chamber 22 through the wall of the handle 2|. The opposit end of the tube is connected into a hollow lug 28 brazed, welded, or otherwise secured to the holder i in alinement with the shaft 3. The lug 28 forms an abutment for the end of the shaft 3, and the hollow pcrtion29 of the lug permits the fiow of lubricant from the tube 27 to the axial passage is in the shaft 3.

A plunger 3| is mounted within the chamber 22, and is actuated therein by a threaded stem 32 extending through a cap 33 screwed onto the outer end of the handle 2!. A handle 361 is provided for rotating the stem 32 to advance or retract the plunger within the chamber.

The modified construction illustrated in Figures and 6 comprises a holder 5 of relatively smaller size arranged to receive a set of dressing discs assembled as a unit by suitable securing means 35 applied through the openings 36. A recess 31 in the inside face of at least one of the holder arms is arranged to receive the end of a shaft 3 through which an axial passage 56 opens. A tube 38 communicates betweenthe recess 3i and a grease cup 39 mounted as a handle upon the back of the holder 1. The grease cup may be of conventional style, having a cap movable to apply pressure to grease contained in the cup.

In operation, the dressing tool is used in the ordinary manner by holding the toothed edges of the discs 2 squarely against the emery wheel to be dressed. As the wheel i rapidly rotated, the teeth of the several discs are engaged successively by the emery wheel, and are rotated thereby. The movement of each tooth causes the next tooth to strike sharply against the face of the emery wheel. The rapid succession of such impacts causes the surface of the emery Wheel to be chipped away, the tool being manipulated by the workman until irregularities in the face of the wheel have been removed and the wheel has been trued up. y

In dressing tools heretofore commonly used, no provision has been made for lubricating the bearing. surfaces upon which the dressing discs rotate. Fine particles of emery chipped from the Wheel rapidly find their way into the bearing areas, with the result that the bearings quickly become worn. As wear progresses the looseness of the bearings permits the discs to wobble and prevents the discs from being held squarely against the emery wheel. The bearing members then must be replaced. The life of the bearing is very short, frequently being only a matter of a few hours of actual service. The utility of th bearing members is usually destroyed before the teeth of the discs are worn sufiiciently to require replacement; but the wear on the bearing surfaces of the discs themselves precludes their further use, even though a new shaft 3 and sleeve 4 is supplied. As a result, the entire assembly of discs, shaft and bearing sleeve must be replaced at frequent intervals and at substantial expense.

In using the dressing tool of my present invention, the workman applies sufficient pressure to the supply of lubricant within the chamber 22, by turning the stem 32to advance the plunger 3 I therein, to cause lubricating grease to be forced through the passage 23 to the passage 16 of the shaft 3. From the axial passage l6, grease passes through a passage i? to a groove I 8 along which it is distributed throughout the length of the sleeve 4. Some of the grease passes outwardly through the openings is in the sleeve 4 to the bearing surfaces between the discs and the sleeve, and between the adjacent faces of the discs, the grease being distributed along the length of the sleeve l by the grooves 29.

By making the passages 23, I6 and/or I1 relatively small, pressure applied in the chamber 22 will cause grease to be fed to the bearing surfaces for a considerable period of time; and an occasional turn of the handle 34 will cause a substantially continuous flow of grease through the shaft 3 tothe bearing surfaces.

Such a flow of grease carries the particles of emery away from the bearing areas; and, by providing proper lubrication, prolongs the, life of the bearing surfaces indefinitely. Instead of requiring frequent replacement of both the discs and the shaft and sleeve, the lubricating means of my invention causes the bearing members to outlive several sets of the dressing discs, with consequent saving both in the expense of replacement parts, and labor in effecting the replacement.

I claim:

1. A tool for dressing emery wheels comprising aholder, a shaft upon the holder, a sleeve journaled upon the shaft and having a lubricant delivery passage, a plurality of dressing discs journaled upon the sleeve, and force feed means carried by the holder for supplying lubricant through the sleeve passage to the bearing areas between the sleeve and the discs and shaft.

2. A tool for dressing emery wheels comprising a holder, a shaft upon the holder, a sleeve journaled upon the shaft and having a lubricant delivery passage, a plurality of dressing discs journaled upon the sleeve, and force feed means carried by the holder for continuously supplying lubricant under pressure to the bearing areas between the sleeve and the discs and shaft.

3. A tool for dressing emery wheels comprising a holder, a shaftupon the holder, a sleeve journaled upon the shaft, a plurality of dressing discs journaled upon the sleev'e,'-a hollow handle attached to the holder and arranged to contain a supply of lubricant, said holder having passages for conducting lubricant fromthe handle to the shaft and said shaft and sleeve having-passages fordistributing the lubricant to the inner and outer bearing surfaces of the sleeve, and force feed means for applying pressure to the lubricant within the handle for forcing lubricant through the distributing passages'to thebearing surfaces.

4. A tool-for dressingemeryWheels compris- "inga holdeig'a'shaft upon'the holder and having inter-communicating longitudinal and radial passages, a sleeve 'journaled upon the shaft andhaving intercommunicating radial and longitudinal passages, a plurality of dressing discs journaled upon the sleeve, a hollow handle attached to the holder and arranged to contain a supply oflubricant, said holder having passages for conducting lubricant from the handle to the passages of the shaftwand thence to the passages of the sleeve, and force feed means for applyingpressure to} the lubricant'within the handle.

"5.- A=tool' for dressing emery wheels comprising a'holder, a shaft upon the holder, said shaft having a lubricating passage extending from an -end thereof to bearing areas on the surface of the shaft intermediate said ends, a sleeve journaled upon the shaft and provided with passages for conducting lubricant from the shaft passages to the outer surface of the sleeve, a plurality of dressing discs journaled upon the sleeve, a handle attached to the holder and provided with a lubricant chamber, means communicating between the chamber and the lubricating passage for directing lubricant from the chamber to the passages of the shaft and sleeve, and force feed means for applying pressure upon the lubricant within the chamber for maintaining a substantially continuous flow of lubricant through the shaft to the sleeve and dressing discs journaled thereon.

SAMUEL B. FINNERTY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

